The best replacement for switchable graphics is uma.

The best alternatives to switchable graphics are rated as following:
★★★★★  uma
★★★★  integrated
★  discrete graphics

Your alternative for switchable graphics is not listed? Suggest!
Speaking about switchable graphics, one probably shouldn't forget about fglrx.

Other search terms related to switchable graphics and their ratings are:
★★★★★ fglrx
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Google Trends

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switchable graphics
uma
integrated